<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      div {
        width: 200px;
        height: 200px;
        background-color: red;
        margin: 100px auto;
        transition: all 1s;
        /* 1.可以跟方位名词 */
        /* transform-origin: left bottom; */
        /* 2. 默认的是 50%  50%  等价于 center  center */
        /* 3. 可以是px 像素 */
        transform-origin: 50px 50px;
      }

      div:hover {
        transform: rotate(360deg);
      }
    </style>
  </head>

  <body>
    <div></div>
  </body>
</html>
